MRI Power Amplifier PCB Balun Layout for Compact RF Output
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Solution Overview
Problem
Existing power amplifier units for magnetic resonance devices are bulky due to separate baluns for each power amplifier module, making a compact design impossible.
Innovation Solution
A compact power amplifier unit design where multiple power amplifier modules share a single balun on a printed circuit board (PCB), eliminating the need for separate baluns and coaxial cables, and incorporating a heat-conducting material in air-filled cavities to enhance cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate baluns are used for each power amplifier module, then signal asymmetrization is reliable, but the device occupies large space
Solution Approach 1:
The patent merges multiple separate baluns into a single shared balun that receives combined signals from multiple power amplifier modules. This consolidation reduces the number of components and overall device volume while maintaining the necessary signal asymmetrization function through the shared balun's design.
Solution Approach 2:
The shared balun is designed to perform the asymmetrization function for multiple power amplifier modules simultaneously, making it a multi-functional component that replaces what would traditionally require multiple separate baluns. This universal design approach maintains reliability while reducing component count.
2Reliability
If separate baluns and coaxial cables are used for each power amplifier module, then signal transmission is reliable, but the device complexity increases
Solution Approach 1:
The patent combines multiple signal transmission paths into a single shared transmission path leading to the shared balun. This reduces the number of coaxial cables and connection points required, thereby reducing device complexity while maintaining signal transmission reliability through proper impedance matching and shielding in the shared path.
3Ease of operation
If power amplifier modules are operated separately with individual baluns, then signal control is precise, but the device occupies large space
Solution Approach 1:
The patent merges the control and signal paths for multiple power amplifier modules into a unified architecture where a single shared balun receives combined signals. This reduces the physical space required for individual baluns and their associated wiring, achieving compactness while maintaining precise control through the shared component's design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly reduces the size and cost of the power amplifier unit while maintaining high power output, achieving efficient heat dissipation and electromagnetic field integrity.
Implementation Method 1
incorporating a heat-conducting material in air-filled cavities to enhance cooling
Data Source
AI summary
A power amplifier unit for a magnetic resonance device includes at least two power amplifier modules. Symmetrical output signals from the at least two power amplifier modules are fed to a shared balun. The shared balun is provided on a printed circuit board (PCB) and is realized in a unit with the at least two power amplifier modules. The balun is configured to asymmetrize a sum signal.